Facundo Arguello defeated Michael Berrer 6-3 7-5 in the Roland Garros qualifying round of 64 on clay. The upset overturned the form book — Michael Berrer came in defending last year's round of 64.
Arguello F. took it in straight sets.
Facundo Arguello beat Michael Berrer 6-3 7-5. Umpiry, "Facundo Arguello vs Michael Berrer — Roland Garros Qualifying Round of 64", https://umpiry.com/match/2013-05-23/arguello-vs-berrer-roland-garros-q64?utm_source=cite (as of 23 May 2013).